Improvement in lifting-jacks



Unmans'ra'rns PATENT Qrrron.

HERMAN BROGKSMITH, OF ST. LOUIS, MISSOURI, ASSIGNOR OF ONE HALF HISRIGHT TO ERNEST QUAST, OF JERSEYVILLE, ILLINOIS.

IMPROVEMENT IN LlFTlNG-JACK S.

Specification forming part of Letters Patent No. 161,925, dated April13, 1975; application filed December 4, 1874.

To all whom it may concern Be it known that I, HERMAN BRooKsMIrH, of St.Louis, in the county of St. Louis and State of Missouri, have invented anew and Improved Lifting-Jack; and I do hereby declare that thefollowing is a full and exact description of the same, reference beinghad to the accompanying drawings, and to the letters of reference markedthereon.

The withindescribed invention is an improved lifting-jack, designed,mainly, for raising heavy vehicles, such as wagons, omnibuses, 860.; andconsists in certaindetails of construction, whereby the implement isrendered unusually po werful, compact, and inexpensive.

1n the drawings, Figure is a side elevation of the jack, and Fig. 2 isan edge view of the same.

A and B, Fig. 1, represent two sections of the standard, the uppersection being adapted to move vertically upon the lower one. theparallelism of the two parts being maintained by the two overlappingtongues a and b, which slide vertically in guide-loops formed by theiron bands 6 e e e. The steps on the top of section B are for thepurpose of adapting the jack to lift vehicles of difi'erent heights. 0represents a lever pivoted to the movable section B at the point p, andto this lever is pivoted, at the point r, the upper extremity of thelink 9, whose lower end is similarly secured to the standard A.

In using the device it is placed under the vehicle, in such a positionthat the axle will rest on one of the steps of the movable section B.The lever O is then depressed, as indicated by the arrow, until theshoulder m (shown in dotted line) comes in contact with the side of thelink g. By this operation the section B is forced upward a distanceequal to the distance of the center of the pivot r from that of thepivot 19; and, further, the shoulder m being so distanced as to come incontact with the link 9 only when the pivot 4 (whose travel is indicatedin dotted line) has justpassed the lower center, the section B issecurely locked in position by its superincum bent weight.

I claim as my invention The lifting-jack described, having the parts AB, with overlapping tongues a I), securinglinks e e, lever U, and linkg, the lever being provided with a limiting-shoulder, m, by means J ofwhich the position of the link is determined when the jack is fullyraised, as described.

This specification signed and witnessed this 24th day of November, 1874.

HERMAN BROOKSMITH.

Witnesses:

G. W. KURTZEBORN, PETER MEELE.

